大陆深部地壳物质成分识别方法综述

Petrogenesis and Geochemical Composition of Continental Deep Crust:Overview

本文系统总结了大陆深部地壳物质成分识别研究方法和元素丰度合理性检验的方法,以期为大陆深部地壳物质成分探测提供技术方法体系。深部地壳物质成分识别的主要方法有:①因构造运动抬升出露到地表的中下地壳剖面;②地表出露的高级变质地体;③产于火山岩中的深部地壳捕掳体,如麻粒岩捕掳体;④地球物理测深资料与深部岩石物理性质的高温高压实验测定结果之间的拟合和⑤壳源岩浆岩源区地球化学示踪。元素丰度合理性检验的方法主要有地表热流和元素比值法。

This paper summarizes the approaches and research progress in the continental deep crust in the hope of providing some better understanding of the petrogenesis and geochemical composition of continental deep crust in China. Five approaches have been widely used to identify the composition of the deep crust. They are （1） Middle-or lower crustal cross-sections are exposed on the surface due to tectonic lifting; （2） high-grade high-grade metamorphic terranes exposed; （3） deep-crustal xenoliths occurring in volcanic pipes, such as granulite xenoliths; （4） fitting between geophysical deep survey and experiment of physical features of deep rock at high temperature and pressure; and （5） geochemical trace of the rocks from deep crust. The methods to verify the rationality of element abundance are surface heat-flow measurements and key element ratios.